Chapter 15 Quiz Laser

Some_____________ lasers have a pulse duration measured in nanoseconds.

The ____ of the laser must be ________________ than the ________________ to be effective

You can have pulse durations long enough that are FDA approved for safety but at the same time not effective as the pulse duration is too long and not allowing the target chromophore to __________

In laser permanent hair reduction, the pulse duration should be longer than the thermal relaxation time of the ______________ but shorter than the thermal relaxation time of the _____________

Correctly match the following terms and concepts

Generally, when performing permanent hair reduction, the greater the _______________ the smaller the ______________

The amount of time it takes for the tissue that is being lasered to cool down enough so it doesn’t get damaged is a simple way to describe

Based on the lesson, the epidermis cools down ____________ than the _______________.

In the lesson, Kris states that melanin absorption decreases with longer wavelengths. This means that, ignoring other factors, a ____________laser should theoretically be less effective than a ____________ laser for permanent hair reduction.

Because 800nm is roughly 1/5 greater of 1064nm and we learned that the longer the wavelength the lesser the absorption into melanin, then it is true that an 800nm laser has 1/5 greater absorption into melanin than does the 1064nm laser.

Thermal relaxation time can be confusing. One way to think of it is that to have a safe but effective treatment, the __________________ has to have enough fluence to be ____________ while, at the same time, the __________________ has to be kept cool enough to not be destroyed. By knowing the thermal relaxation time for each tissue type, we are able to adjust our pulse duration, fluence, and spot size to achieve this.

Based on absorption coefficients, it would be ineffective or unsafe to use a _____________ laser for _________________. Sekect ALL that apply.